Passive valve type hydraulic down-the-hole hammer

Abstract

The invention discloses a passive valve type hydraulic down-the-hole hammer. The passive valve type hydraulic down-the-hole hammer comprises an upper connector, a nozzle, a gasket, an inner cylinder, a core valve, an outer cylinder, a punch hammer, a half-closed hoop, a square sleeve and an anvil, wherein the bottom of the upper connector is connected with the top of the outer cylinder; the nozzle and the gasket are arranged in the upper connector; the inner cylinder is arranged in the outer cylinder; a valve element and a valve rod of the core valve are inserted into a valve element cavity and a valve rod cavity of the inner cylinder correspondingly; a piston cavity is formed in the bottom end of the inner cylinder; a piston and a hammer body of the punch hammer are inserted into the piston cavity of the inner cylinder and a hammer body cavity of the outer cylinder correspondingly; the bottom of the outer cylinder is connected with the square sleeve; and the anvil is inserted into the square sleeve. According to the passive valve type hydraulic down-the-hole hammer, the probability of blockage of moving parts can be effectively lowered, the underground working reliability of the hydraulic hammer is improved, the rigid reverse beating phenomenon of the punch hammer is completely eliminated, the liquid energy utilization rate is increased, and the service life of parts prone to damage is prolonged; the impact performance can be adjusted by simply changing the structural parameters of the nozzle and the core valve, and the pump displacement of normal work of the hydraulic hammer is adjusted and guaranteed within a large range; and the passive valve type hydraulic down-the-hole hammer has the technical advantages that the structure is simple, machining is convenient, and the manufacturing cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical fields of drilling engineering and geological core drilling, in particular to a valve-type hydraulic down-the-hole hammer. Background technique [0002] During the drilling or geological core drilling process, the hydraulic down-the-hole hammer (hereinafter referred to as the hydraulic hammer) connected to the upper end of the drill bit or core drilling tool generates high-frequency axial vibration driven by the drilling fluid and outputs high-frequency axial vibration to the drill bit. The rotary motion of the drill bit is combined with the rock, and the rock is cut and broken in the way of impact and rotary, so as to improve the drilling efficiency. [0003] The current valve-type hydraulic hammer is easy to block the core valve in the environment of high-viscosity drilling fluid. When the hydraulic hammer is working, the hammer has a rigid counterattack. The technical defect that it is difficult to match the d...

AI Technical Summary

Problems solved by technology

[0003] The current valve-type hydraulic hammer is easy to block the core valve in the environment of high-viscosity drilling fluid. When the hydraulic hammer is working, the hammer has a rigid counterattack. The technical defect that it is difficult to match the displacement when the drill) is working together

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